The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names Menkar, a Cet, alf Cet, 92 Cet, HR 911, HD 18884, SAO 110920, FK5: 107
other names Mekab, Menkab, Monkar
constellation Cetus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): MENKAR; Mekab; Menkab; Monkar.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 3h 2min 16,8sec DEC: +4 5' 23''
position (J1900) RA: 2h 57min 3sec DEC: +3 41' 51''
proper motion (J2000) RA: -0,009 arcsec/a DEC: -0,078 arcsec/a
radial velocity -26 km/s
note: variable radial velocity
trigonometric parallax 0,009 arcsec


visual magnitude 2,53
(V on UBV Johnson system)

spectral / color information

spectral class M1.5IIIa
B-V-magnitude 1,64
U-B-magnitude 1,94
R-I-magnitude 1,16
note (category: spectra): Ultraviolet FeII emission.

variability information

variable star identification Alp Cet
note (category: variability): Lb? 2.45 - 2.54V. Spectrum var.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 3h 2min 16,773sec DEC: +4 5' 22,93'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0006 arcsec/a DEC: -0,078 arcsec/a source: 25
radial velocity -26 km/s source: 25
trigonometric parallax 0,009 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 173,32 latitude: -45,59
GCI unit vector (J2000) X: 0,698256 Y: 0,712286 Z: 0,071318


visual 2,4 (observed) source: 31
photovisual 2,8 source: 2

spectral information:

spectral class M0 source: 96
Morgan-Keenan M1.5IIIa source: 25
B-magnitude 4,17 0,05 B-V-magnitude 1,64
U-magnitude 6,11 0,05 U-B-magnitude 1,94

variability information:

source of data: 30
variability type 171
var. amplitude 0,09


2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 2h 59min 39,744sec DEC: +3 53' 41,15'' 0,003 arcsec
position (J2000) RA: 3h 2min 16,777sec DEC: +4 5' 22,93''
proper motion J1950 (FK4) RA: -0,0008 arcsec/a DEC: -0,074 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0006 arcsec/a DEC: -0,078 arcsec/a
source of proper motion data Determined by source catalog


visual 2,8 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class M0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 107
Durchmusterung BD+03 419
Boss General Catalogue 3643
Henry Draper Catalogue 18884

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)


position (J1950) RA: 2h 59min 39,7sec DEC: +3 53' 41''

variability informations:

variability type LB: pulsating variable star
magnitute at max. brightness 2,45
magnitute at min. brightness 2,54
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M2III


to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'


ID in the GCVS catalogue 21/9001
constellation Cetus
notes on existence The star is equivalent to '0219004 del'.

variability type description

variability type description
LB Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).